赤外線吸収スペクトルによる残留農薬の測定

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タイトル別名
  • Determination of Pesticide Residues by Infrared Spectrophotometry
  • セキガイセン キュウシュウ スペクトル ニ ヨル ザンリュウ ノウヤク ノ ソクテイ 1
  • I. Recovery of γ-BHC, Dieldrin and Methylparathion from Mulberry Leaves
  • 第1報 γ-BHC,ディルドリン,およびメチルパラチオンの桑葉からの回収

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In the field of sericulture, rapid and rigorous determinations of insecticide residue is an important problem to prevent the pesticide injury to silkworm larvae. In the present research, quantitative infrared analyses of residues of pp'-DDT, γ-BHC, dieldrin and parathion, and their formulations on mulberry leaves were carried out with the use of the potassium bromide disk method in infrared spectrophotometry.<br>The standard curves of these chemicals were made at first using the potassium bromide disk method, and then recovery tests were made with both purified agents and commercial formulations, which were sprayed on mulberry leaves. Out of the spectral characteristics of each agents, three absorption bands were employed as a key band group; i.e. 955, 913 and 782cm-1 of infrared spectra of γ-BHC, 1085, 1005 and 770cm-1 of pp'-DDT, 1178, 1042 and 848cm-1 of dieldrin and 1355, 1035 and 925cm-1 of methylparathion and ethylparathion. Separation of insecticide residues from mulberry leaves was made by double extraction with n-hexane-acetonitril, followed by cleanup procedure with an alumina column.<br>Results of recovery experiments were shown in Table 1. The recovery rate was 70∼80% for γ-BHC and dieldrin and 94∼95% for methylparathion. No interference in determinations was noticed with the existence of an emulsifier in commercially formulated products, except in the BHC emulsion. Even in the BHC emulsion, absorption band due to emulsifier appeared in the 1200∼1000cm-1 range, so that determinations were succesfully made, employing the key band group of 955, 913 and 782cm-1.<br>The determination of the absorption ratio was possible as low as 0.01∼0.015% (20∼30μg/200mg KBr). The time required for the whole procedure, including separation and cleanup of insecticide redidues was one to two hours.

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